Apparatus and method for center signal scaling and stereophonic enhancement based on a signal-to-downmix ratio

US9743215B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Christian Uhle · Nuremberg, DE
• Peter Prokein · Erlangen, DE
• Oliver Hellmuth · Erlangen, DE
• Sebastian Scharrer · Altdorf, DE
• Emanuel Habets · Spardorf, DE

Key dates

• Filing date: Oct 9, 2015
• Grant date: Aug 22, 2017
• Expiry date: Oct 9, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04S2400/05
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for generating a modified audio signal having two or more modified audio channels from an audio input signal comprising two or more audio input channels is provided. The apparatus has an information generator for generating signal-to-downmix information. The information generator is adapted to generate signal information by combining a spectral value of each of the two or more audio input channels in a first way. The information generator is adapted to generate downmix information by combining the spectral value of each of the two or more audio input channels in a second way being different from the first way. Furthermore, the information generator is adapted to combine the signal information and the downmix information to obtain signal-to-downmix information. The apparatus has a signal attenuator for attenuating the two or more audio input channels depending on the signal-to-downmix information to obtain the two or more modified audio channels.